JPH0649659Y2 - Connection structure of extension type earth auger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] In the present invention, a plurality of unit-shaped auger members each having a short size are joined together to form a series of long earth augers. The present invention relates to a lock pin type connection structure provided at a connecting portion of a replenishing type earth auger.

[Conventional technology]

It has been already known that a long earth auger is constructed by adding a plurality of unit-shaped auger members. Also, as a method of fixing the connecting portion of this extension type earth auger, a connecting hole in a direction orthogonal to the axial direction is opened in the inserting type connecting portion in a state where the unit auger member is added, and this connecting hole is formed. A general method is to insert a bolt into the screw and screw a nut to the tip of the bolt.

[Issues to be solved by the device]

However, as described above, the method of fixing the connecting portion of each unit-shaped auger member with the bolts and nuts is
Since a tool must be used to tighten the nut, there is a problem that the tightening work is troublesome. Especially when the auger is placed horizontally and used as a horizontal hole digging for piping, it is necessary to add each auger member in a narrow vertical hole, so it is difficult to tighten the nut.
There is a problem that it takes work time and is inefficient.

Further, since screw blades are continuously connected and provided on the outer periphery of the plug-in type connection portion of each auger member, the position of the nut for tightening the bolt approaches the root of the screw blade almost completely. In this case, there is a problem that the screw blade is an obstacle for tightening the nut with the tool and the tightening work is difficult.

[Means for Solving the Problems]

The present invention is intended to provide a simple means for solving the problems caused by connecting the connecting portion of the auger member with the bolts and nuts as described above. A plurality of unit-shaped auger members each having a insertion tube and a insertion shaft at the other end and having a predetermined short dimension are connected to each other through a connecting portion between the insertion tube and the insertion shaft. In the addition type earth auger in which a long auger is formed by adding, the insertion cylinder and the insertion shaft of each auger member are connected with a connecting hole opened in a direction orthogonal to the axial direction communicating with each other. , The lock pins are connected through lock pins inserted in these connection holes, and both ends of the lock pin have a length protruding outward from the outer peripheral surface of the insertion tube, and split grooves are formed at the both ends. Has the insertion groove in one of the split grooves One end of a curved spring material having a length that fits over the outer peripheral surface half is rotatably attached through a pin, and the other end of the spring material is bent inward in an inverted L shape. An engaging piece with a bent hook is provided, and the engaging piece is inserted into the other end split groove of the lock pin protruding from the front connecting hole to the outside of the insertion tube. Is engaged with the inner lower surface of the split groove.

[Action]

In the connection structure of the auger according to the present invention, the lock pin is first inserted through the insertion type connection portion of each auger member, and the curved spring material axially attached to one end of the lock pin is inserted into the connection portion. While fitting so as to straddle the outer circumference of the cylinder,
The tip of the spring material is fitted into the other end split groove of the lock pin protruding to the opposite side of the insertion tube, and the hooked locking piece at the tip of the spring material is engaged with the inner lower end of the split groove. Since the hooked locking piece at the tip of the spring material is engaged with the inner lower end of the split groove by the spring force, the locked state is maintained unless the force for pulling the locking piece outward is applied after the engagement. It is maintained and prevents the lock pin from slipping out of the connecting hole.

Further, the crimping engagement of the locking piece with the inner lower end of the split groove is sufficient because an operation of inserting the locking piece into the split groove and pushing it in with a fingertip is sufficient.
The connection work can be completed very efficiently and in a short time without using tools. When disassembling the connection part of each auger member with the completion of excavation work, it is enough to pull the locking piece with the fingertip so as to pull it off from the inner lower end of the split groove, so the work at the time of disassembly is also efficient. You can do it.

Since the engagement piece of the spring material maintains the above-mentioned engaged state in a state of being fitted in the split groove, it is prevented from swinging to the left and right in the split groove. The engagement state of the locking piece is not easily released even by rotation.

〔Example〕

An embodiment of the connection structure according to the present invention will now be described with reference to the drawings. FIG. 1 is a sectional view of a connection portion 3 of an auger member 1 showing the connection structure, and FIG. 2 is a lock pin attached to the connection portion 3. It is a perspective view which shows the structure of. This connection structure has an insertion tube 4 at one end as shown in FIG.
A connecting portion 3 composed of the inserting cylinder 4 and the inserting shaft 5 of a plurality of unit-shaped auger members 1 having a predetermined short dimension and having an inserting shaft 5 at the other end, and attached to the connecting portion And a lock pin 8 that is locked.

The auger member 1 is formed by joining a series of long augers by inserting the insertion shaft 5 at one end and the insertion tube 4 at the other end of another auger member 1. The insertion cylinder 4 and the insertion shaft 5 are inserted into each other, and in the state where the ends of the screw blades 2 are connected to each other, the insertion cylinder 4 and the insertion shaft 5 are respectively connected. Connection holes 6 and 7 communicating with each other in the direction orthogonal to the axial direction are opened,
By inserting the lock pin 8 into these connecting holes 6 and 7, the connecting portion 3 by the inserting cylinder 4 and the inserting shaft 5 is inserted.
Are connected together.

The lock pin 8 has a length such that both ends project outward from the outer peripheral surface of the insertion tube 4, and has split grooves 9 and 10 at both ends thereof, and one split groove 9 has , One end of a curved spring material 11 having a length so as to be fitted so as to straddle over the outer peripheral surface half circumference of the insertion tube 4 is rotatably attached to a shaft through a pin 12. . Further, the other end of the spring member 11 is provided with an inverted L-shaped locking piece 13 which is once bent so that a horizontal hook 14 is provided inward, and then the tip is bent outward again. The locking piece 13 is engaged with the other split groove 10 side.

When attaching the lock pin 8 to the connecting portion 3, the spring material 11 is set in a free state, and the other end of the lock pin 8 having the split groove 10 is inserted into the connecting holes 6 and 7 of the connecting portion 3. As shown in FIG. 1, the spring material 11 is fitted on the half circumference of the outer peripheral surface of the insertion tube 4 so that the locking piece 13 of the spring material 11 is split.
The hook 14 is rotated in the direction of 10, and the hook 14 is engaged so as to be pushed into the inner lower surface 10a of the split groove 10 while inserting the locking piece 13 into the split groove 10.

When the locking piece 3 of the spring material 11 is engaged with the inner lower surface 10a of the split groove 10, the lock pin 8 is prevented from moving within the connecting holes 6 and 7, so that the insertion tube 4 and the insertion shaft are prevented. The connection portion 3 with 5 is securely coupled.

〔effect〕

As described above, in the connection structure of the auger according to the present invention, after the lock pin having the curved spring material axially attached is inserted into the connection portion, the inverted L-shaped locking piece at the tip of the spring material is inserted. Through the split groove at the tip of the lock pin, the lock pin is attached by simply engaging the hook of the locking piece with the fingertip on the inner lower surface of the split groove. Connection work can be performed easily and efficiently without using it. Further, even when the auger member is disassembled after the excavation work, the engagement of the locking piece only needs to be pulled and disengaged with the fingertip, so that the lock pin can be easily attached and detached, and an improvement in work efficiency can be expected.

[Brief description of drawings]

FIG. 1 is a sectional view of a connecting portion showing a connecting structure of an auger according to the present invention, FIG. 2 is a perspective view showing a structure of a lock pin attached to the connecting portion, FIG. 3 is a plan view of the connecting portion, and FIG. The figure is a partially cutaway side view showing the end of the auger member. 1: Auger member, 2: Screw blade, 3: Connection part, 4: Insert tube, 5: Insert shaft, 6,7: Connection hole, 8: Lock pin, 9,10: Split groove, 11: Spring material , 12: pin, 13: locking piece, 14: hook.

Claims (1)

[Scope of utility model registration request] 1. A plurality of unit-shaped auger members each having an insertion cylinder at one end and an insertion shaft at the other end and having a predetermined short dimension, and the insertion cylinder and the insertion shaft mutually. In the extension type earth auger in which a long auger is formed by connecting the insertion tube and the insertion shaft of each auger member in a direction orthogonal to the axial direction communicating with each other. And connecting holes formed in the connecting holes through lock pins inserted into these connecting holes, and both ends of the lock pin have a length protruding outward from the outer peripheral surface of the insertion tube. , There is a split groove on both ends, and one end of a curved spring material having a length that fits on one half of the outer peripheral surface of the insertion tube is rotatable in one split groove via a pin. Is pivoted to
At the other end of the spring member, there is provided an engaging piece with a hook that is bent inward in an inverted L shape, and the engaging piece is projected from the front connecting hole to the outside of the insertion tube. A connecting structure for an add-on type earth auger characterized in that the hook is engaged with the inner lower surface of the split groove while being inserted into the split groove at the other end of the lock pin.